Scaffolding.



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SGAFFOLDING. I APPLIGATION FILED APR. 26, 1913.

Patented June 30, 1914.

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Inventor,

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M. 0. ELVESTROM.

SCAFFOLDING.

APPLIGATION FILED APR.26, 1913.

Patented June 30, 1914.

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COLUMBIA PLANOGRAPH CO..\VASHINGTON n r M. O. ELVESTROM.

SGAFFOLDING.

APPLICATION FILED APILZG, 1913.

Patented June 30, 1914.

3 SHEETS--SHBET 3.

Witnesses J 665% I 11119111501! 7724M 0, m By his Aiiorneyfi COLUMBIA PLANOGRAFH CO.,WASHXNGTON, 0.4:.

UNITED STATES PATENT rnio.

MARTIN o. ELvns'raor/nor BRIGELYN, MINNESOTA.

2 SOAFFO'LDING.

T0 (ZZZ whom it may concern Be it known that I, MARTIN O. ELVE- sraonr, a citizen of the United States, residing at Bricelyn, in the county of Faribault and State of Minnesota, have invented certain new and useful Improvements in Scaffolding; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains, to make and use the same.

My invention relates to improvements in scaffolding adapted for general use, but is especially designed for use on silos and like buildings.

To the above ends, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings: Figure l is a diagrammatic section, taken vertically through the upper portion of a silo and having mounted thereon my improved scaffolding, shown in side elevation; Fig. 2 is a plan view of the improved scaffolding, with some parts removed and some parts broken away; Fig. 3 is a detail view in section, taken on the line :r -ar of Fig. 2, on an enlarged scale; Fig. & is a. detail view principally in section, taken on the line w en? of Fig. 1, on an enlarged scale; Fig. 5 is a side elevation of the parts shown in Fig. 4, with some parts removed; Fig. 6 is a view partly in side elevation and partly in sec tion, taken on the line 00 m of Fig. 2, on an enlarged scale, some parts being shown in different adjustments, by means of dotted lines; Fig. 7 is a detail view partly in side elevation and partly in section, taken on the line m af of Fig. 6; and Fig.8 is a transverse section, taken on the line an -m of Fig. 7 on an enlarged scale.

For the purpose of illustrating my improved scaffolding in working position, a portion of a silo has been shown in the drawings.

The numeral 1 indicates the walls of the silo and the numeral 2 the conical roof thereof. Anchored at the apex of the roof 2 is a stub post 3.

The numeral 4 indicates the A-frame of the scaffolding anchored to the post 3, for vertical adjustment and for circumferen- Specification of Letters Patent.

Application filed April 26, 1913.

Patented June so, rare.

Serial No. 763,721.

tial movement around the post '3, by an anchor-bar 5 and a collar 6. Oneend of the bar 5 ispivotally secured, by a bolt 7, to a pair of laterally spaced anchor lugs 8, integrally formed with the collar 6, and the other end of said bar 5 is adjustably secured to the apex of the frame a by nut-equipped bolts 9, passed through alined perforations in said bar 5 and the two side bars of the frame 4-. As shown, the side bars of the frame a are preferably constructed from angle irons. The collar 6 is made in two sections connected by nut-equipped bolts 10, to permit the-same, when separated, to be applied around the post- 3. This construction will be found very convenient in applying the collar 6 to a tall pole, such as a flag staff, as it would not be necessary to slip'the collar over the top of the pole, as is now customary. To insure free and easy rotary movement of the collar 6, the'same is-mounted in a two-partbushing l1, appliedjaround the post 3. I

A pa1r of supporting wheels 12, set one ahead of the other, to run on the roof 2.; are

mounted one on each of the side bars of the frame at. hiounted in the hub of each wheel 12 is a bushing 13, having flanged ends that embrace the adjacent faces of the wheel rubs. One of the flanges of each bushing 13 is made removable, to permit the bushings to be telescoped into the .wheel hubs. For. locking the wheels 12 against lateral movements on the side bars of the frame 4,

a pair of vertically spaced tapered pins '14 are driven into perforations formed in the horizontal flanges of the side bars of the frame 4. These pins le also keep the parts of the bushings 13 assembled'in' the wheel hubs.

A horizontally extended shaft 15. projects transversely across the free'end portion ,stirrups 22, for different adjustments, by cross heads 23. The stirrups 22 are rigidly secured to the cross tie bars 4? of the frame 4:, and they are preferably constructed, as shown, from T-irons having their interme diate flanges turned inward. Outwardly projecting trunnions A on the bearings 20 are ournaled in bearing lugs 25 on the cross heads 23, to permit vertical swinging movement of the bearings 20. llut equipped bolts 26 are provided for frictionally clamping the cross heads 23 onto the intermediate flanges of the stirrups 22. Keyed or otherwise secured to the intermediate portions of the counter shaft 19 is a worm 27, which meshes with a gear 28, rigidly secured to the shaft 15. 11 the outer projecting end of the counter shaft 19 is a grooved sheave 29, having mounted thereon a depending operating cable 30. A. platform or workmans seat 31 is suspended. from the windlass drum 18 by cables 32, arranged to be wound onto or unwound from the windlass drum 18. The cable 30 is of a length suflieient to extend within reach, at all times, of the platform 31.

Obviously, by operating the cable 80, the Windlass drum 18 may be rotated in either direction, at will, through the several connections extending from the sheave 29 to the shaft 15. The cable 30 will pinch or bind in the groove of the sheave 29 and prevent slipp ng of the same thereon. It may easily be seen that, by adjusting the cross heads 23 on the stirriugs 22, the counter shaft 19 can always be kept in a horizontal posi tion, irrespective of the pitch of the roof to which the scaffolding is applied. By the use of my improved scaffolding, one can work completely around the silo and at any elevation tl ereof, without changing the scaffolding after the same has once been secured in position. By adjustably connecting the l tframe at to the bar 5, the platform 31 can be set at a convenient working distance from the walls of the silo, irrespective of the diameter thereof. Obviously, the worm 27 and gear 28 will lock the Windlass drum 18 against rotation and thereby support the platform 31 where set.

l Vhat I claim is:

1. in a workmans scalfolding for silos and the like, a frame having means for pivotally anchoring the same to a roof, provided, near its free end, with Wheels located one ahead of the other and arranged to run on said roof, a Windlass and a worm and gear, for operating the same, mounted on the free end of said frame, a platform having a cable suspended from said Windlass, means for rotating said worm in either direction, at will, from said platform, including a sheave connected to said worm, a cable werlring on said sheave, and means for changing the angularity of said sheave with respect to said platform.

2. In a workmans scaffolding for silos and the like, a frame having means for pivotally anchoring the same to the roof and provided, near its free end, with wheels located one ahead of the other, and arranged to run on said roof, a Windlass shaft journaled on the free end of said frame, a shaft journaled on said frame, for angular adjustments with respect thereto, a worm and gear connection between said two shafts, a platform having a cable suspended from said Windlass shaft and means for rotating said worm shaft in either direction, at will, from said platform.

3. In a worlnnans scaffolding for silos and the like, the combination with a roof having an anchoring post, of a longitudinally divided sleeve loosely journaled on said post, a frame, a bar pivotally secured to said sleeve for vertical movement and a'djustably connecting the apex of said frame to said sleeve, wheels set one ahead of the other, and journaled on said frame, to run on the roof, and a platform suspended from the free end of sald frame.

In testimony whereof I afhx my slgnature in presence of two wltnesses.

MARTIN O. ELVESTROM.

Witnesses:

A. G. SAMPSON, A. B. ELVESTROM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

